Medium Axial Fan Blade (500-1100mm) — UTEK-DELE Axial Fan Range

The medium class carries most industrial cooling duty. Blade diameters between roughly 500 mm and 1100 mm are large enough to move serious air volume, while the impeller still fits inside a standard fan ring and stays light enough for belt or direct drive.

Five series cover this band: the P Series for adjustable-pitch pressure duty, the low-noise sickle-blade S Series, the widely used 7Z, the K Series for high airflow in narrow installation spaces, and the R4Z bi-directional aluminium blade. All of them share the Z hub family, so the shaft interface is consistent across a plant even when the blade type changes.

Model Range and Specifications

Blade count is the main tuning parameter in this class: higher counts raise static pressure, lower counts favour airflow and reduce blade-passing noise.

Blade Materials and Temperature Range

Blade material is selected from the working temperature and from the atmosphere around the impeller:

The conductive PAGAS option is supplied for equipment working in explosive-risk atmospheres such as dust or gas. It addresses the working environment of the blade; machine-level certification remains the responsibility of the equipment builder.

Hub Options

Blades are supplied with matched hub sets. The hub carries the blade loads and sets the shaft interface, so it is selected together with the blade count:

Typical Applications

This series is normally specified for the following duties:

• Cooling towers and industrial heat exchangers

• Low-noise ventilation where blade-passing noise is regulated

• HVAC, compressors and engine-driven equipment

• Dust and gas atmospheres where conductive blades are specified

Specification Support

When a fan is being specified or replaced, the following points are confirmed before a blade set is released. They are the same checks used for OEM programs and for retrofit projects.

• Duty point: airflow and static pressure required at the working speed, taken from the cooling pack or ventilation requirement

• Installation: available diameter, shroud clearance, mounting pattern and the shaft interface of the existing hub

• Environment: maximum air temperature, dust or gas atmosphere, and whether static discharge has to be avoided

• Drive: available power, belt or direct drive, and whether the fan has to reverse in service

• Service: blade weight for handling during maintenance and spare-part availability across the machine fleet

Blade count, profile and material are then matched to those conditions in a fixed order: material first, then blade count, then hub family, with diameter confirmed against the shroud. Working in that sequence keeps the mechanical interface stable when the duty requirement changes later in the project, and it is why the same blade family can often stay in production while the cooling pack is revised.

Quality Assurance and Dynamic Balancing

Medium impellers are supplied as matched blade and hub sets and balanced on a hand laser balancing machine before shipment. The explosion-proof blade design used for conductive duty is covered by a granted Chinese utility model patent (CN 222315403 U).

Customization and Series Overview

Blade count, blade profile, hub family and material can be customized for OEM programs, and existing fans can be reviewed when airflow, noise or durability has to be improved on a running machine. Below this class the small H, PMAX and 4XR blades are used, and above it the large W and U series take over from 1000 mm to 2200 mm.

Related ranges: .